Three-dimensional Reconstruction of Coronal Mass Ejections by CORAR Technique through Different Stereoscopic Angle of STEREO Twin Spacecraft
Three-dimensional Reconstruction of Coronal Mass Ejections by CORAR Technique through Different Stereoscopic Angle of STEREO Twin Spacecraft
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日地关系观测站双体飞船不同立体角度相关辅助重建技术三维重建日地物质抛射
DOI：
10.3847/1538-4357/abd9c9
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Quanhao Zhang
中科院分区：
文献类型：
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作者：
Shaoyu Lyu;Yuming Wang;Xiaolei Li;Jingnan Guo;Chuanbing Wang;Quanhao Zhang
最近，我们开发了相关辅助重建（CORAR）的方法来重建太阳风的不均匀结构，或瞬态，使用双视图白光图像。这种方法被证明是有用的研究瞬变的形态和动力学特性，如斑点和日冕物质抛射（CME），但重建的精度可能会受到两个航天器之间的分离角度。基于HELCATS项目中的日球成像仪CME联合星表中的双视CME事件，研究了不同STEREO立体角度下CORAR方法重建CME的质量。我们发现当航天器的分离角在150°左右时，大多数CME事件都能得到很好的重建。如果考虑共线效应，最佳分离角应在120° ~ 150°之间。通过与HELCATS日球成像仪几何星表中给出的日冕物质抛射方向的比较，证明CORAR方法得到的日冕物质抛射参数是合理的。然而，CORAR获得的方向在经度上偏向子午面，在纬度上偏向赤道面。提出了一个经验公式来校正这些偏差。这项研究为我们最近提出的太阳环使命概念的航天器配置提供了基础。
Recently, we developed the correlation-aided reconstruction (CORAR) method to reconstruct solar wind inhomogeneous structures, or transients, using dual-view white-light images. This method is proved to be useful for studying the morphological and dynamical properties of transients like blobs and coronal mass ejection (CME), but the accuracy of the reconstruction may be affected by the separation angle between the two spacecrafts. Based on the dual-view CME events from the Heliospheric Imager CME Join Catalogue in the Heliospheric Cataloguing, Analysis and Techniques Service (HELCATS) project, we study the quality of the reconstruction of CME using the CORAR method under different STEREO stereoscopic angles. We find that when the separation angle of the spacecraft is around 150°, most CME events can be well reconstructed. If the collinear effect is considered, the optimal separation angle should locate between 120° and 150°. Compared with the direction of the CME given in the Heliospheric Imager Geometrical Catalogue from HELCATS, the parameters of the CME obtained by the CORAR method are reasonable. However, the CORAR-obtained directions deviate toward the meridian plane in longitude, and toward the equatorial plane in latitude. An empirical formula is proposed to correct these deviations. This study provides the basis for the configuration of the spacecraft of our recently proposed Solar Ring mission concept.